Revert of Reenable WebrtcBrowserTest.CanMakeEmptyCallThenAddStreamsAndRenegotiateEnable test again.

Revert of Reenable WebrtcBrowserTest.CanMakeEmptyCallThenAddStreamsAndRenegotiateEnable test again. (patchset #2 of https://codereview.chromium.org/254713004/)

Reason for revert:
Still failing:

http://build.chromium.org/p/chromium.mac/builders/Mac%2010.6%20Tests%20%28dbg%29%281%29/builds/52254/steps/content_browsertests/logs/CanMakeEmptyCallThenAddStreamsAndRenegotiate

Original issue's description:
> Reenable WebrtcBrowserTest.CanMakeEmptyCallThenAddStreamsAndRenegotiateEnable test again.
> The underalying problem is now fixed. See http://crbug/293125 and  https://code.google.com/p/webrtc/source/detail?r=5870
> 
> BUG=293125, 362431
> 
> Committed: https://chromium.googlesource.com/chromium/src/+/b9a00c2caf679dfd2e97a3d6bbfd5e214609e1fc

[Finnur, 2014-08-25 12:02:00]

Created Revert of Reenable
WebrtcBrowserTest.CanMakeEmptyCallThenAddStreamsAndRenegotiateEnable test again.

[commit-bot: I haz the power, 2014-08-25 12:02:57]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/finnur@chromium.org/500033003/1

[commit-bot: I haz the power, 2014-08-25 12:02:57]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-08-25 12:02:58]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[pauljensen, 2014-08-25 12:36:34]

Finnur, I created my own revert CL as your's got stuck while you were at lunch. 
Feel free to close this one.